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I'm trying to send mail via SQL DB Mail. &nbsp;I have the profile and account setup and working. &nbsp;When I send email to an internal recipient everything works fine. &nbsp;But if I try to send to an email address that is not internal, I get this error message:<br />
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Cannot send mails to mail server. (Mailbox unavailable. The server response was: 5.7.1 Unable to relay for thoecherl@premiercomputing<wbr />.com).<br />
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The server OS is Server 2003.<br />
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How can I fix this?
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I'm trying to send mail via SQL DB Mail.  I have the profile and account setup and working.  When I send email to an internal recipient everything works fine.  But if I try to send to an email address that is not internal, I get this error message:

Cannot send mails to mail server. (Mailbox unavailable. The server response was: 5.7.1 Unable to relay for thoecherl@premiercomputing.com).

The server OS is Server 2003.

How can I fix this?

SQL DB Mail error

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.